Demonstration 1: short term memory

We were asked to remember series of numbers and write them down after Mr. Peter read them to us. I managed to remember upto 7 digits of numbers.
We can remember 7 + or - 2 things at a time which means that my memory was right at the average. However there are people who can remember more things and there was a student in his class who managed to remember up to 12 digits of number.
A trick that can help us remember series of information is by grouping or chunking them.
If we group 12 digits into 4 groups of 3 digits then we will have only 4 information to remember instread of 12 information.